Causey Mounth

Constructed in the Middle Ages, the Causey Mounth was created as an elevated rock causeway to span many of the boggy areas such as the Portlethen Moss.

A considerable portion of the alignment of the Causey Mounth is illustrated on the UK Ordnance Survey map,[1] although a large fraction of the route cannot be navigated by a conventional passenger vehicle (particularly at the crossing of the Burn of Pheppie).

As late as the Early Middle Ages, the Mounth, or easternmost range of the Grampian Mountains, posed a formidable terrestrial barrier isolating the northeast of Scotland from the Scottish Lowlands.

The Causey Mounth was traversed by the Marquess of Montrose and William Keith, 7th Earl Marischal, when they commanded a Covenanter army of 9,000 men in the first battle of the Civil War in 1639.

After crossing through the boggy Portlethen Moss (which historically had a much larger extent than at present), the route passes west of a massive megalithic standing stone.